Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: pergunta: quais são todos os percentuais (1990) onde o estado é mississippi
 ###Tabelas: CREATE TABLE record_by__conference (record_by__conference_id AUTO_INCREMENT PRIMARY KEY, Conference VARCHAR, # of Bids INT, Record VARCHAR, Win % INT, Round of 32 INT, Sweet Sixteen VARCHAR, Elite Eight VARCHAR, Final Four VARCHAR, Championship Game VARCHAR) CREATE TABLE groups_3_ribbons_+_2_hoops (groups_3_ribbons_+_2_hoops_id AUTO_INCREMENT PRIMARY KEY, Nation VARCHAR, T Score INT, A Score INT, E Score INT, Total INT) CREATE TABLE world (world_id AUTO_INCREMENT PRIMARY KEY, Rank INT, City 1 VARCHAR, City 2 VARCHAR, 2012 Passengers (in millions) INT, 2011 Passengers (in millions) VARCHAR, Distance VARCHAR) CREATE TABLE norwegian_americans_by_state (norwegian_americans_by_state_id AUTO_INCREMENT PRIMARY KEY, State VARCHAR, Norwegian Americans (1980) INT, Percent (1980) VARCHAR, Norwegian Americans (1990) INT, Percent (1990) VARCHAR, Norwegian Americans (2000) INT, Percent (2000) VARCHAR, Norwegian Americans (2009) INT, Percent (2009) VARCHAR) CREATE TABLE top_8_teams_qualified_for_team_finals (top_8_teams_qualified_for_team_finals_id AUTO_INCREMENT PRIMARY KEY, Position VARCHAR, Country VARCHAR, Floor VARCHAR, Pommel Horse VARCHAR, Rings VARCHAR, Vault VARCHAR, Parallel Bars VARCHAR, Horizontal Bar VARCHAR, Team Total VARCHAR)  
SELECT Percent (1990) FROM norwegian_americans_by_state WHERE State = Mississippi